AA 9909 then AA 2778 at Phoenix
Salt Lake City → Phoenix → Boston
Timetable, Phoenix time
14:30AA 9909 from Salt Lake City at the gate
13:43AA 2778 to Boston leaves the gate
23 h 13 apart on the timetable, overnight
AA 2778 leaves 23 h 13 after AA 9909 arrives on the timetable: more than half a day, so not a connection we count.